Beam tuning and stabilization using beam phase measurements at GANIL

Owing to the great sensitivity of the beam phase to the various parameters, on line beam phase measurements proved to be a very efficient way of tuning and stabilizing the beam of the multi-accelerator complex. The authors recall the system which allows to obtain the different kinds of accurate measurements they need and describe the main applications: tuning process (buncher and SSC's RF phase determination, setting of the required radial beam phase law in the SSC's), stabilization of the beam by loops, the basic principle of which being to keep constant the beam central phase all along the machine by adjusting RF voltages or magnetic fields. Feedback loops are described and comparative results with and without feedback are given